UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1074 



Washington, D. C. 



Issued November 8, 1922; revised August, 1923 



CLASSIFICATION OF AMERICAN 

 WHEAT VARIETIES 



By 



J. ALLEN CLARK, Agronomist in Charge, JOHN H. MARTIN, 

 Agronomist, Western Wheat Investigations, and CARLETON 

 R. BALL, Cerealist in Charge, Office of Cereal Investigations, 

 Bureau of Plant Industry 



CONTENTS 



Necessity for a Classification of Wheat . 1 



Previous Investigations 2 



Foreign Classifications 3 



American Classifications 7 



Summary of Previous Classifications . 9 



Present Investigations 10 



Classification Nurseries 11 



Preparing Descriptions, Histories, and 



Distributions 15 



Varietal Nomenclature 17 



The Wheat Plant 22 



Morphological Characters 23 



Physiological Characters 47 



Page 



Classification of the Genus Triticum . . 48 



Key to the Species or Subspecies . . 50 



Common Wheat 50 



Club Wheat 172 



Poulard Wheat ' 180 



Durum Wheat 183 



Emmer 193 



Spelt 195 



Polish Wheat 197 



Einkorn 198 



Unidentified Varieties 199 



Estimated Acreage of Varieties 207 



Literature Cited 219 



Index to Varieties and Synonyms . . . .231 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1922 



